One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,6,5)(3,8,7,4)(9,10)(11,17)(12,14)(13,20)(15,19)(16,22)(18,23)(21,24)(25,26)(27,28)(29,32)(30,33)(31,35)(34,36)(37,38)(39,40)(1,3,6,7)(2,4,5,8)(10,12)(15,17)(16,20)(23,24)(27,31)(28,35)(34,39)(36,40)(9,11)(10,15)(12,17)(13,18)(14,19)(16,23)(20,24)(21,22)(25,27,30,31)(26,28,33,35)(29,34,38,39)(32,36,37,40)(2,5)(4,8)(9,11)(10,15)(12,17)(13,21)(14,19)(16,24)(18,22)(20,23)(25,26)(27,28)(29,37)(30,33)(31,35)(32,38)(34,40)(36,39) involution — undirected(1,4,6,8)(2,7,5,3)(9,12,14,10)(11,17,19,15)(13,20,22,16)(18,24,21,23)(25,28)(26,31)(27,33)(29,36)(30,35)(32,39)(34,37)(38,40)(1,5,6,2)(3,8,7,4)(9,13,14,22)(10,16,12,20)(11,18,19,21)(15,23,17,24)(25,29)(26,32)(27,34)(28,36)(30,38)(31,39)(33,37)(35,40)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.